Here's a test that should, in my opinion be passing but is not.

[TestMethod]
public void can_get_open_generic_interface_off_of_implementor()
{
    typeof(OpenGenericWithOpenService<>).GetInterfaces().First()
        .ShouldEqual(typeof(IGenericService<>));
}
public interface IGenericService<T> { }
public class OpenGenericWithOpenService<T> : IGenericService<T> { }

1. Why does this not pass?
2. Given Type t = typeof(OpenGenericWithOpenService<>) how do I get typeof(IGenericService<>)?

I'm generally curious, but if you're wondering what I'm doing, I'm writing a Structuremap convention that forwards all interfaces implemented by a class to the implementation (as a singleton).